Modeling the Partial Renewable Power Curtailment for Transmission Network Management

Abstract

Congestion problems are increasing in number in power transmission networks due to the increment of renewable power sources along it. To reduce their impact, Transmission System Operators (TSOs) as the French RTE use network reconfiguration or renewable power curtailment in complex subtransmission areas. The operators need enhanced methodological tools to better address the optimal power flow management problem by also using novel levers as for example the storage devices. This paper proposes mathematical models which integrate the possibility to partially curtail the renewable power in the form of a dynamical system representing the transmission network, also considering storage devices.

Predictive Control for Zonal Congestion Management of a Transmission Network

“…We revisit the linear model based on Direct Current (DC) approximation described in [2] and, for facilitating the presentation, present the delay-free case. In view of transmission network modeling, the following working hypothesis are considered:…”

“…, and M c , M b and M t that are composed by the elements b n ij obtained by the PTDF computation described in (2). The k th line in these matrices corresponds to the PTDF of the k th line of F ij at nodes where generation can be curtailed, at nodes where a battery is installed or at nodes where the injections may vary, respectively.…”

“…From the structure point of view, the prediction model is linear, but this comes at the price of a model mismatch in the evaluation (estimation) of the power increments in (3) before the resolution of ( 16). An alternative with an improved fidelity of prediction but a slightly more complex prediction model involving integer variables has been discussed in [2]. Finally, given the uncertainty of the estimation for the power generation, the use of long prediction horizons without anticipatory information is detrimental and can lead to cautious control, which is deleterious for the global use of the transmission network.…”

“…In order to build a resilient and decentralized system composed by zones, only a local description of each zone is considered for control purposes: the connection with the remaining network is defined as a perturbation acting on the zone. In [2], the authors provide a dynamical model based on Power Transfer Distribution Factor (PTDF) (see [3], [4]) that extends previous modeling for zones that only allowed on/off decision on power curtailment [5], [6]. The proposed model targets the possible use of model-based optimal control to manage the subtransmission area congestion situation.…”

“…The goal of the present paper is to validate the utilisation of a real-time control strategy as Model Predictive Control (MPC) [7] to operate the storage devices and partially curtail power from renewables whenever the constraints on the operation of power lines are violated [8], [9]. A simplified not-delayed version of the model in [2] is used to describe the dynamical system model proposed for model-based control, and the simulation tool MATPOWER [10] with the full French grid data [11] is set to simulate the power transmission line under various scenarios, using real data for renewable power generation. While the main contribution is the mathematical description of the design framework, an industrial case study on the control of a zone will be considered for the illustration of the main congestion management features.…”